SimpleEmailSystem

All required features have be implemented.

Additional information:

1. When #EXIT is executed, the user would be logged out from the system. The connection remains there, and authentication is needed for further uses.
2. When exit is executed, the client will gracefully shutdown the connection and terminate the program.
3. Empty lines input are ignored at client level.

Run Server:

python3 MailServer.py

Run Client:

python3 MailClient.py